package cn.hyxy.hadoop;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.Mapper.Context;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttributeImpl;
import org.wltea.analyzer.lucene.IKAnalyzer;

public class Demo12_MyWritableMR extends Configured implements Tool{
	@Override
	public int run(String[] args) throws Exception {
		if(args.length!=2) {
			System.out.println("usage ...");
			return -1;
		}
		// 7:声明Job
		Configuration config = getConf();
		FileSystem fs = FileSystem.get(config);
		Path path = new Path(args[1]);
		if(fs.exists(path)) {
			fs.delete(path, true);
		}
		// 8:Job
		Job job = Job.getInstance(config, "中文分词");
		
		job.setJarByClass(getClass());
		
		job.setMapperClass(MyMapper.class);
		job.setMapOutputKeyClass(Text.class);
		job.setMapOutputValueClass(LongWritable.class);
		// 10:设置Reduce
		job.setReducerClass(MyReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(LongWritable.class);
		// 设置读取的文件
		FileInputFormat.addInputPath(job, new Path(args[0]));
		FileOutputFormat.setOutputPath(job, path);
		// 开始任务
		boolean boo = job.waitForCompletion(true);
		return boo ? 0 : 1;
	}

	public static void main(String[] args) throws Exception {
		int code = ToolRunner.run(new Demo09_CNWordCountMR(), args);
		System.exit(code);
	}

	
	public static class MyMapper extends Mapper<LongWritable, Text, Text, LongWritable> {
		
		private Text text=new Text();
		
		@Override
		public void map(LongWritable key, Text value, Context context)
				throws IOException, InterruptedException {
			String[] strings=value.toString().split("\\s+");
			
		}
	}

	public static class MyReducer extends Reducer<Text, LongWritable, Text, LongWritable> {
		
		@Override
		protected void reduce(Text key3, Iterable<LongWritable> value3,
				Reducer<Text, LongWritable, Text, LongWritable>.Context context) throws IOException, InterruptedException {
			long sum = 0;
			for (LongWritable ii : value3) {
				sum = sum + ii.get();
			}
			context.write(key3, new LongWritable(sum));
		}
	}

}
